Tree Swallows Fill the Sky during Fall Migration

The annual fall migration of tree swallows has begun. Big numbers of swallows are showing up at favored spots across Cape Cod and the Islands. These attractive and hardy small birds are able to digest Bayberries and leisurely move south in the fall feasting on these abundant ripening fruits. As they move south, transporting and depositing the seeds by defecating on newly created shores and dunes, they are both making more bayberry and improving prospects for future migrations. It is profitable for both the birds and the plants.